Weather in Lake Saimaa

About Lake Saimaa

Lake Saimaa is Finland's inland sea, a labyrinth of 188,000 islands, peninsulas, and channels creating an archipelago-like landscape that few people beyond Finns even know exists. The lake is home to the endangered Saimaa ringed seal—among the world's rarest seals with only 400 individuals. It's a landscape of quiet, deep mystery: water reflecting forest, islets hosting lonely cabins, and a serene emptiness that feels genuinely remote.

Country

Finland

Best months to visit

Year-round

Currency

EUR

Language

Finnish

Things to do in Lake Saimaa

Kayaking through the island maze Lake fishing for pike and perch Sauna visits and lakeside cottage experiences Photography of landscape and wildlife Guided wildlife tours for seal spotting Boat rentals and water sports

Weather by month

Click any month for detailed weather information and travel tips.

January

-4C

Cold, with some rainy days.

February

-2C

Cold, with some rainy days.

March

Cold, with some rainy days.

April

Cold, with occasional showers.

May

14C

Cool, with some rainy days.

June

20C

Mild and comfortable, with some rainy days.

July

21C

Mild and comfortable, with some rainy days.

August

20C

Mild and comfortable, with some rainy days.

September

14C

Cool, with some rainy days.

October

Cold, with some rainy days.

November

Cold, with some rainy days.

December

-1C

Cold, with some rainy days.

Lake Saimaa is Finland's largest lake system, a sprawling maze of over 14,000 islands and channels that's home to the critically endangered Saimaa ringed seal, found nowhere else on Earth. The region around Savonlinna combines this watery wilderness with one of Finland's most striking medieval castles, making it a quieter, lake-focused alternative to the country's coastal cities.

Best areas to stay in Lake Saimaa

Savonlinna

The main town on Lake Saimaa, home to Olavinlinna Castle and the summer opera festival.

Linnansaari National Park

An island-studded national park within Lake Saimaa, a key habitat for the Saimaa ringed seal.

Punkaharju

A narrow, scenic ridge of land between lake channels, popular for walking and cycling.

Lappeenranta

A southern lakeside town near the Russian border, with a historic fortress area.

Getting to Lake Saimaa

✈

Flights

Helsinki is the main international gateway, around 3-4 hours from the Saimaa region by train or car.

⏱

From London

~3 hours by air from London to Helsinki, plus an onward journey of several hours.

🚕

Getting around

A hire car is recommended for reaching lakeside towns and national parks; seasonal cruise boats connect some areas by water.

Frequently asked questions

When is the best time to visit Lake Saimaa?

June-August for boating, swimming and lake cruises; the Savonlinna Opera Festival in the castle takes place each July.

Can I see the Saimaa ringed seal?

Sightings are rare given how endangered the species is, but boat tours in certain protected areas offer a chance, particularly with a knowledgeable guide.

What is Olavinlinna Castle?

A well-preserved medieval castle on an island in Savonlinna, founded in the 15th century and home to the Savonlinna Opera Festival each summer.

Is the area good for cottage holidays?

Yes — lakeside cottages (often with a private sauna) are a classic and popular way to experience the Saimaa region in summer.

How do I get around the lake region?

A hire car is useful for reaching different parts of the lake system; cruise boats also operate seasonal routes between towns.

Traveler reviews

★★★★★

Stayed in a lakeside cottage with its own sauna and jetty — the kind of simple, restorative trip that's hard to find elsewhere in Europe.

Riikka E. · July 2024

★★★★★

Saw the Savonlinna Opera Festival in the castle courtyard, which was a stunning setting for a performance. The lake views from the castle walls were a bonus.

Owen G. · August 2023

★★★★☆

Took a boat tour hoping to spot a Saimaa seal — no luck, but the scenery among the islands was beautiful regardless.

Tiina K. · June 2024